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A Study on the Improvement of NOx Reduction Efficiency for a Urea SCR System (Sixth Report)~Clarifying N₂O Formation Mechanism
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
It is recognized that N₂O having 310 times CO₂ global warming potential, tends to be produced due to NH₃ slip from Urea SCR catalysts. To investigate N₂O formation mechanism and reduce its emission, we have conducted both experiment and chemical kinetics simulation studies. The results have shown that the reactions associated with NH₃ and NO produces N₂O in the oxidation catalyst and its peak appears around a 200°C exhaust gas temperature. It has also been found out that the catalytic volume and urea injection quantity should be optimized to prevent NH₃ slip.